Answer:
B
Step-by-step explanation:
Remark
The easiest way to do this is to Substitute for y in the top equation.
2x + 4y = 18 Divide by 2
2x/2 + 4y/2 = 18/2
x + 2y = 9
Substitute -3x + 2 in for y in the equation above
x + 2(-3x + 2) = 9
x - 6x + 4 = 9
Combine like terms on the left
-5x + 4 = 9
Subtract 4 from both sides.
-5x + 4-4 = 9- 4
-5x = 5
Divide by -5
-5x/-5 = 5/-5
x = - 1
That makes A and C incorrect.
y = -3x + 2
y = -3(-1) + 2
y = 3 + 2
y = 5
The correct answer should be (-1,5) which is B
Answer:
35.235
Step-by-step explanation:
because 78.3*0.45 = 35.235
2/5
think of .4 out of 1, or 4/10, then simplify, to 2/5
Answer:
940 m
Step-by-step explanation:
Above sea level is measured as positive and below sea level is measured as negative.
In order to find the distance between both we need to find the difference between their elevation and depression.
Distance between Grace and her friend
= 647 - (-293)
= 647 + 293
= 940 m
