Answer:
<h2>(x,y)=(6,-2)</h2>
Step-by-step explanation:
<h3>to understand this</h3><h3>you need to know about:</h3>
- linear equation
- system of linear equation
- solving system of linear equation by graphing
- PEMDAS
<h3>given:</h3>
<h3>tips and formulas:</h3>
- to solve system of linear equation by graphing we have to simplify the linear equations to slope-intercept form
- slope intercept form:y=mx+b
<h3>let's solve:</h3>
let's simplify first linear equation to slope -intercept form
x+y=4
y=-x+4
table for this equation
<h3>see the first attachment picture</h3>
let's simplify first linear equation to slope -intercept form
![\sf7x - 6y = 54](https://tex.z-dn.net/?f=%20%5Csf7x%20%20-%206y%20%3D%2054)
![\sf - 6y = - 7x + 54 \\ \sf \frac{ - 6y}{ - 6} = \frac{ - 7}{ - 6} x + \frac{54}{ - 6} \\ \sf y = \frac{7}{6} x - 9](https://tex.z-dn.net/?f=%20%5Csf%20%20-%206y%20%3D%20%20-%207x%20%2B%2054%20%5C%5C%20%20%5Csf%20%20%5Cfrac%7B%20-%206y%7D%7B%20-%206%7D%20%20%3D%20%20%5Cfrac%7B%20-%207%7D%7B%20-%206%7D%20%20x%20%20%2B%20%20%5Cfrac%7B54%7D%7B%20-%206%7D%20%20%5C%5C%20%5Csf%20y%20%3D%20%20%5Cfrac%7B7%7D%7B6%7D%20x%20-%209)
table for this equation
<h3>see the second attached picture</h3>
solutions by graphing the system of linear equation
<h3>see the last attached picture</h3>
note: the red line is for first equation as well as the green line is for second equation and the black dot is the coordinates of the solutions of x and y
A; b; c; d = first; second; third; fourth shelfa + b + c + d = 250 cmb = 2a + 18c = a - 12d = a + 4in terms of a, plug all equations into originala + (2a + 18) + (a - 12) + (a +4) = 2505a + 10 = 2505a = 240a = 48b = 2(48) + 18b = 96 + 18b = 114 cm/1.14 m
Step-by-step explanation:12 is like 45 percent of 26