Question

Points a and b both on line y=3x+7 work out the missing y coordinate for a and the missing x coordinate for b

Answer 1

Answer:

Missing $y$ coordinate for $a$ is $3x+7$

Missing $x$ coordinate for $b$ is $\frac{b-7}{3}$

Step-by-step explanation:

Given: Equation of a line is $y=3x+7$

To find: missing $y$ coordinate for $a$ and the missing $x$ coordinate for $b$

Solution:

First find missing $y$ coordinate for $a$

Put $x=a$ in $y=3x+7$

$y=3(a)+7=3a+7$

Now find the missing $x$ coordinate for $b$

Put $y=b$ in $y=3x+7$

$b=3x+7\\3x=b-7\\\\x=\frac{b-7}{3}$