Answer:
<h2><em><u>
x = 3 is the answer</u></em></h2>
Step-by-step explanation:
<em><u>1. Write the equation.</u></em>
y = -2x
y = 5x - 21
<em><u>2. Substitute the values.</u></em>
(-2x) = 5x - 21
<em><u>3. Solve the equation.</u></em>
-2x = 5x - 21
-5x - 5x
-7x = -21
<em><u>4. Both negatives cancel</u></em>
7x = 21
<em><u>5. Divide both sides by 7</u></em>
7x = 21
/7 /7
<em><u>6. x = 3</u></em>
<em><u>7. Check the answer.</u></em>
-2(3) = 5(3) - 21
-6 = 15 - 21
-6 = -6
<h2><em><u>
x = 3 is the answer</u></em></h2><h2><em><u>
</u></em></h2>
Hope this helped,
Kavitha
P.S Sorry for taking so long.